The absorption kinetics of Antarctic krill oil phospholipid liposome in blood and the digestive tract of healthy mice by single gavage

Antarctic krill(Euphausia superba)oil has been gaining increasing attention due to its nutritional and functional potentials.Krill oil usually contains a high concentration(about 50%)of phospholipids(AKOP)rich in DHA and EPA accompanied with 30%–40%triacylglycerols.Phospholipids can be made into liposomes without emulsifiers due to its amphiphilic characteristics.However,the absorption kinetics of AKOP liposome in vivo is not clear,which restrict the molecular mechanism analysis related to its distinct bioactivities.The lipid analysis in serum,small intestinal content and wall was carried out after oral administration of AKOP liposome to illustrate its absorption kinetics in blood and the digestive tract of healthy mice by single gavage.The major type of the obtained AKOP was phosphatidylcholine,and the total contents of the DHA and EPA were 29.31%.AKOP liposome was almost completely digested in the small intestine in 1 h and the hydrolysis products could be quickly absorbed by intestinal enterocytes.The DHA in serum peaked at 2 h after administration of AKOP liposome.AKOP liposome could be quickly digested and absorbed in vivo.The obtained results might provide a scientific basis for the molecular mechanism analysis related to distinct bioactivities of Antarctic krill oil phospholipid.

Nitrogen absorption by alpine forage species based on 15N tracer technique in a hydroponic culture

Based on 15N tracer technique,absorption of different concentrations of ammonium nitrogen(N-NH^(4+)),nitrate nitrogen(N-NO^(3-))and glycine(NGly)by root of six species of alpine forage(Puccinellia tenuiflora,Poa crymophila,Festuca sinensis,Elymus nutans,Elymus sibiricus and Bromus inermis)was studied in a hydroponic culture.The uptake kinetic parameter was analyzed according to Michaelis-Menten equation.The Michaelis-Menten equation represents the velocity equation for the relationship between the initial rate of an enzymatic reaction and the substrate concentration.The result showed that the absorption range of ammonium nitrogen,nitrate nitrogen and glycine by root of six species of alpine plant were 1.1-20.9μmol·g^(-1)·h^(-1),0.4-3.4μmol·g^(-1)·h^(-1) and 0.1-3.7μmol·g^(-1)·h^(-1),which accounts for 68.8%-74.7%,12.0%-27.0%and 4.3%-13.4%of total absorptivity,respectively.The six kinds of P.tenuiflora,P.crymophila,F.sinensis,E.nutans,E.sibiricus and B.inermis showed significant difference in nitrogen absorption.At the same concentration,the absorption of nitrogen in different forms of the same herbage is different.The absorptive amount of ammonium nitrogen was the highest among them,then the glycine,the nitrate nitrogen was least absorbed.The results could provide a theoretical basis for nitrogen utilization in alpine forages.For example,P.tenuiflora showed a much higher ability of absorbing nitrogen nutrition in a high salt environment and could be a more suitable herbage to be planted in saline-alkali soil in the Qinghai-Tibet Plateau as compared with E.nutans.

mproved Hydrogen Storage Properties of Ti_(23)V_(40)Mn_(37)Alloy Doped with Zr_(7)Ni_(10) by Rapid Solidification

As-cast and rapidly solidified Ti_(23)V_(40)Mn_(37)alloy doped with Zr_(7)Ni_(10) was synthesized by arc melting and melt-spinning.The microstructure,activation property,hydrogen absorption kinetics,and hydrogen absorption/desorption thermodynamics were investigated to evaluate a comprehensive hydrogen storage property of the alloys.Both preparation methods had a negligible effect on the lattice parameter of BCC and C14 Laves phases in the alloys.The alloy prepared by melt-spinning showed an increased proportion of BCC phase,larger hydrogen absorption capacity,faster hydrogen absorption rate,and higher hydrogen absorption/desorption platform pressure.The dehydriding enthalpy and endothermic peak temperature of the rapidly solidified alloy were 33.55±2.14 KJ/mol H_(2)and 526.2 K,respectively,which are smaller than those of the as-cast alloy.It indicates the decreased hydride stability and improved hydrogen desorption property.By contrast with the as-cast alloy,the rapidly solidified alloy showed a preferable comprehensive hydrogen storage property.

Effect of thickness on the photophysics and charge carrier kinetics of graphitic carbon nitride nanoflakes

We investigated the thickness effect on the photophysics and charge carrier kinetics of graphitic carbon nitride nanoflakes （g-CNN） by using ultraviolet visible diffuse reflectance spectroscopy, atomic force microscopy, femtosecond transient absorption spectroscopy, and picosecond time-correlated single photon counting measurement. For the first time, we found that g-CNN displays a layer-dependent indirect bandgap and layer-dependent charge carrier kinetics.

Hydrogenation behaviors and characteristics of bulk Ti-6Al-4V alloy at different isothermal temperatures

The bulk Ti-6Al-4V alloy was hydrogenated at the temperature range of 723-973 K,and the hydrogen absorption characteristics and hydrogen absorption kinetics were investigated.The results show that there are two types of hydrogen absorption characteristics at different temperatures.The hydrogen content decreases,and the time reaching reaction equilibrium is shorten with the isothermal hydrogenation temperature increasing.Meanwhile,the mechanism of the hydrogen absorption kinetics is different at different temperatures.The incubation period exists at the initial hydrogen absorption stage below 823 K,and K(a2)(the reaction rate constant of Stage 2)>>K(a1)(the reaction rate constant of Stage 1).And there is no incubation period over 823 K,K(a1)>>K(a2).

Synthesis,structural study,thermal,optical properties and characterization of the new compound[C6H7N2O2]3TeCl5·2Cl

The new organic-inorganic compound, [C_6H_7N_2O_2]_3TeCl_5·2Cl was synthesized and its structure was determined at room temperature in the triclinic system （P^-1） with the following parameters： a = 10.5330（11） ？, b = 10.6663（11） ？, c = 15.9751（16）？, α = 82.090（2）°, β = 71.193（2）°, γ = 68.284（2）°and Z = 2. The final cycle of refinement led to R = 0.057 and Rw = 0.149. The crystal structure was stabilized by an extensive network of N--H···Cl and non-classical C--H···Cl hydrogen bonds between the cation and the anionic group. Several thermal analysis techniques such as thermogravimetric analysis, differential scanning calorimetric analysis and evolved gas analysis were used. We used isoconversional kinetics methods to determine the kinetics parameters. We observe that the decomposition of [C_6H_7N_2O_2]_3TeCl_5·2Cl entails the formation hydrochloric acid of nitroaniline as volatiles. The infrared spectra were recorded in the4000–400 cm^（-1）frequency region. The Raman spectra were recorded in the external region of the anionic sublattice vibration 50–1500 cm^（-1）. The optical band gap was calculated from the UV-Vis absorbance spectra using classical Tauc relation which was found to be 3.12 and 3.67 eV.